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flight-training device
floor locks
moves under its own power until moment it comes to rest
at end of flight. For flying boats and seaplanes, buoy-tobuoy
time (see block time).
2 For gliders and sailplanes, time from start of takeoff
until end of landing.
3 For vehicles released in flight from parent carrier,
measured from moment of release.
4 Aggregate of ** of all flights made by same basic
structure or other hardware item.
flight-training device Invariably, this is synonymous
with flight simulator.
flight vector Direction of travel; except in still air, not the
same as azimuth of longitudinal axis. Essentially = track.
flight visibility Average forward horizontal distance
from cockpit (assumed at typical light-aircraft FL) at
which prominent unlighted object may be seen and
identified by day and prominent lighted object may be
identified by night.
flightway The airspace immediately beyond the end of a
runway or other takeoff path; this concept has fallen into
disuse.
flight weight Similar to production item; not a battleship
test construction.
flightworthy Ready for flight; for aircraft, airworthy.
Flight Zero Brief unplanned flight, caused by sudden
event during fast taxi or other testing prior to Flight 1.
flimsy orders Printed on onion-skin paper, can be eaten.
flinger ring Uses centrifugal force to inject W/M [in
some Turbomeca engines, fuel] from entry to engine
compressor.
FLIP, Flip 1 Flight information publication.
2 Floated lightweight inertial platform.
flip-flop 1 Bistable multivibrator; device having two
stable states and two input signals each corresponding
with one state; remains in either state until caused to flip
or flop to other.
2 Bistable device with input which allows it to act as
single-stage binary counter.
flipper 1 Elevator (US colloq.).
2 Before turning on final, flaps, pitch, power [some add
roll].
FLIR, Flir Forward-looking IR.
FLIS Federal Logistics Information Systems (US).
Flit Fighter lead-in training (USAF, Holloman).
FLL 1 Flight line (two words) level (UK/NATO).
2 Fördergesellschaft für Luftschiffbau und Luftschiffahrt
eV (G).
FLM 1 Flightline maintenance, or mechanic (US).
2 Foot-launched microlight.
3 Focused-lethality munition.
FLMTS Flight line maintenance test set (Kollsman).
FLO 1 Flow control [of traffic]; -E adds East, -W West
(ICAO).
2 Defence logistics organization (Norway); /Luft adds
Air.
Flo Floodlights available on landing.
fLo Local-oscillator frequency.
float 1 Horizontal distance travelled between flare and
landing or alighting (see ground effect).
2 Watertight body with planing bottom forming
alighting gear of * seaplane. Also wingtip *.
3 Ability of control surfaces to trail freely in airstream
except when commanded by input; reckoned negative
when surface deflected away from relative wind and positive
when (because of overbalance ahead of hinge axis)
surface moves against it.
4 Buoyant capsule in carburettor [carbureter].
floatation See flotation.
float displacement Mass of water displaced by totally
submerged seaplane float.
floated gyro Floating gyro.
floated position That assumed by flight-control surface
[esp. manual] in absence of pilot input.
float gear Floats (2) applied as modification to landplane.
floating ailerons Designed to float (3).
floating gudgeon pin Free to rotate in both piston and
connecting rod.
floating gyro Mass supported by hydrostatic force of
surrounding liquid.
floating lines In photogrammetry, lines connecting same
two points of detail on each print of stereo pair; used to
determine whether or not points are intervisible, and
drawn directly on prints or superimposed by transparent
strips.
floating mark Mark or dot seen as occupying position in
three-dimensional space formed by stereoscopic pair,
used as reference in stereoscopy.
floating point EDP (1) positional notation in which
corresponding places in different quantities are not
necessarily occupied by coefficients of same power; eg
186,000 can be represented as 1.86 × 10 5 . By shifting ** so
number of signficant digits does not exceed machine
capacity, widely varying quantities can be handled.
floating reticle One whose image can be moved within
FOV.
float light See flare (3).
floatplane See float seaplane.
float seaplane Aeroplane supported on water by
separate floats (2), usually 2 or 3.
float-type carburettor Head of fuel supplied to jet is
controlled by float (4) and needle valve.
float valve Fluid valve regulated by float acting on level
in container.
float volume Ratio of seaplane gross weight to mass of
unit volume (traditionally 1 ft 3 ) of water.
FLOLS Fresnel-lens optical landing system.
flood To overfill float chamber of carburettor, hence
flooded.
flooder control Simple inceptor, usually a pull-wire, with
which piston-engine float chamber can be flooded manually
to provide rich mixture for starting.
flood flow 1 Unrestricted supply of hot high-pressure air
to cockpit either for demist/deicing, or in emergency, or
by auto switch triggered by excessive cabin altitude.
2 Has similar (various) meanings in oxygen systems.
floodlight Light providing general illumination over
particular area.
flood valve Controls flow of fire extinguishant.
floor Notionally, the hangar *; thus, place of work, esp.
for A&P.
floor-loaded Aircraft is in factory for refurbishment or
rework.
floor loading 1 Actual number of aircraft being
modified.
2 Maximum [or actual] number of passengers.
floor locks Rows of attachments which interface with
seating or VLDs.
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